5817
ADDRESSABLE
28-LINE DECODER/DRIVER
5817
ADDRESSABLE
28-LINE DECODER/DRIVER
Intended for use in ink-jet printer applications, the A5817SEP
addressable 28-line decoder/driver combines low-power CMOS inputs
and logic with 28 high-current, high-voltage bipolar outputs. A 4-to-14
line decoder determines the selected output driver (n) in each
14-driver bank. Two independent output enable inputs (active low)
then provide the final decoding to activate 1- or 2-of-28 outputs
(OUT
An
and/or OUT
Bn
). Special internal circuitry is programmed at the
time of manufacture to adjust the output pulse timing and thereby the
energy the device delivers to the ink-jet print head.
The CMOS inputs cause minimal loading and are compatible with
standard CMOS, PMOS, and NMOS logic. Use with TTL or DTL
circuits may require appropriate pull-up resistors to ensure an input
logic high. The internal CMOS logic operates from a 5 V supply.
A CHIP ENABLE function is provided to lock out the drivers during
system power up. The 28 bipolar power outputs are open-collector
30 V Darlington drivers capable of sinking 500 mA at ambient
temperatures up to 85°C.
The A5817SEP is furnished in a 44-lead plastic chip carrier
(quad pack) for minimum-area, surface-mount applications.
Data Sheet
26186.20
OUTPUT ENABLE B
LOGIC SUPPLY
CHIP ENABLE
IN
D
(MSB)
GND
43
GND
IN
C
IN
B
42
41
IN
A
(LSB)
OUT B0
OUTB1
OUTB2
OUTB3
OUTB4
OUTB5
OUTB6
OUTB7
OUTB8
OUTB9
GND
IC
7
8
9
10
11
12
13
14
15
16
17
ABSOLUTE MAXIMUM RATINGS
at T
A
= 25
°
C
Output Voltage, V
CE
.............................
30 V
Logic Supply Voltage, V
DD
..................
7.0 V
Input Voltage Range,
V
IN
.......................
-0.3 V to V
DD
+ 0.3 V
Output Current, I
C
...........................
600 mA
Package Power Dissipation, P
D
.....
2.70 W*
Operating Temperature Range,
T
A
.................................
-20
°
C to +85
°
C
Storage Temperature Range,
T
S
..............................
-55
°
C to +150
°
C
*Derate at rate of 22 mW/°C above T
A
= 25°C.
Caution: CMOS devices have input static
protection but are susceptible to damage
when exposed to extremely high static
electrical charges.
t y
c l
u n
d O .
o e P
r
P nc E
d e 7S
e r 1
u fe 8
in e 6
t R A
n r
o o
y
c F
b
s
i n
d
D
e
w lac
o p
h e
S R
39
38
37
36
35
34
33
32
31
OUTA0
OUTA1
OUTA2
OUTA3
OUTA4
OUTA5
OUTA6
OUTA7
OUTA8
OUTA9
GND
OUTPUT DRIVER BANK B
4-TO-14 LINE DECODER
OUTPUT DRIVER BANK A
V
DD
44
40
6
5
4
3
2
1
OUTPUT ENABLE A
30
29
25
19
20
18
21
22
23
24
OUTB11
OUTB10
OUTB13
OUTA11
A13
26
OUT
B12
OUTA12
A10
IC
IC
27
OUT
OUT
NC
28
Dwg. PP-050
FEATURES
s
Controlled Characteristics for Ink-Jet Printers
s
Addressable Data Entry
s
30 V Minimum V
(BR)CEX
s
CMOS, PMOS, NMOS Compatible Inputs
s
Low-Power CMOS Logic
Always order by complete part number:
A5817SEP
.
5817
ADDRESSABLE
28-LINE DECODER/DRIVER
FUNCTIONAL BLOCK DIAGRAM
OUTPUT ENABLE A
OUTPUT ENABLE B
OUT B11
OUT B12
OUTN
LOGIC SUPPLY
CHIP ENABLE
IN D (MSB)
IN A (LSB)
IN B
IN C
TURN-ON
DELAY
4-TO-14 LINE DECODER
OUT A13
A2
OUT A12
A0
B0
OUT A1
OUT B1
B2
OUTA11
Dwg. FP-032
TYPICAL INPUT CIRCUIT
VDD
TYPICAL OUTPUT DRIVER
IN
Dwg. EP-021-7
Dwg. EP-010-1
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
W
Copyright © 1993, Allegro MicroSystems, Inc.
OUTB13
OUT
OUT
OUT
OUT
TURN-ON
DELAY
5817
ADDRESSABLE
28-LINE DECODER/DRIVER
ELECTRICAL CHARACTERISTICS at T
A
= +25
°
C, V
DD
= 5.0 V.
Limits
Characteristic
Output Drivers
Output Leakage Current
Output Saturation Voltage
I
CEX
V
CE(SAT)
V
CE
= 30 V
I
OUT
= 450 mA
I
OUT
= 400 mA
Output Breakdown Voltage
Unclamped Inductive
Load Current
Turn-On Time
Fall Time
Turn-Off Time
Rise Time
Control Logic
Logic Input Voltage
V
IN(1)
V
IN(0)
Logic Input Current
I
IN(1)
I
IN(0)
Input Resistance
Supply Current
R
IN
I
DD(ON)
I
DD(OFF)
Two Outputs ON
All Drivers OFF, All Inputs = 0 V,
OE
A
= OE
B
= V
DD
V
IN
= 5.0 V
V
IN
= 0 V
3.5
—
—
—
50
—
—
—
—
<1.0
<-1.0
—
6.0
—
—
0.8
100
-100
—
10.0
600
V
V
µA
µA
kΩ
mA
µA
V
(BR)CEX
—
t
PHL
t
f
t
PLH
t
r
R
L
= 56
Ω
V
CC
= 30 V, L = 3
µH,
R
L
= 56
Ω,
I
L
= 500 mA, Test Fig.
V
CC
= 21 V, R
L
= 39
Ω
V
CC
= 21 V, R
L
= 39
Ω
V
CC
= 21 V, R
L
= 39
Ω
V
CC
= 21 V, R
L
= 39
Ω
125
—
175
—
—
0.85
0.8
30
<1.0
1.15
1.1
—
See Note
225
20
250
50
475
—
400
—
100
1.45
1.4
—
µA
V
V
V
—
ns
ns
ns
ns
Symbol
Test Conditions
Min
Typ
Max
Units
Note: Device will turn off and meet all specifications after test.
5817
ADDRESSABLE
28-LINE DECODER/DRIVER
OUTN
L
R
V CC
IL
Dwg. EP-044
UNCLAMPED INDUCTIVE LOAD CURRENT TEST FIGURE
A
IN
A-D
B
t
ENABLE
OUTPUT ENABLE
(A and/or B)
t
PHL
90%
OUTPUT VOLTAGE
N
50%
10%
t
OUT
t
PLH
50%
90%
10%
t
f
t
r
Dwg. WP-017
(Logic Levels are V
DD
and Ground)
A. Minimum Data Active Time Before Output Enable (Data Set-Up Time) ............ 150 ns
B. Minimum Data Hold Time After Output Enable (Data Hold Time) ..................... 250 ns
TIMING CONDITIONS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
5817
ADDRESSABLE
28-LINE DECODER/DRIVER
APPLICATIONS INFORMATION
This device is intended specifically for, although
certainly not limited to, driving ink-jet print heads. In
this application, a certain minimum energy (a function
of load voltage and output pulse duration) is required
for proper operation, while excessive energy will
degrade the life of the print head. The output pulse
duration (t
OUT
) is equal to t
ENABLE
+ t
PLH
– t
PHL
, where
t
PHL
is adjusted during manufacture to compensate for
variations in the output saturation voltage (V
CE(SAT)
).
For the A5817SEP, the relationship between t
OUT
and t
ENABLE
at T
A
= 25°C is:
t
OUT
= t
ENABLE
([V
CE(SAT)
(actual) – V
CE(SAT)
(typical)]
x
330 ns) + 25 ns + 110 ns.
For most applications, this will result in a driver-
contribution-to-energy-error of less than
±4%.
A logic low on the CHIP ENABLE input will
prevent the drivers from turning ON, regardless of the
state of other inputs or the logic supply voltage. The
CHIP ENABLE input has a slow response time and
should not be used as a high-speed control line. For
proper operation, all ground terminals should be
connected to a common ground on the printed wiring
board. The IC (Internal Connection) terminals are
used to program the turn-on time of the device and
MUST
be left electrically unconnected (floating) for
proper operation.
IN
D
(MSB)
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
DECODER TRUTH TABLE
IN
C
IN
B
IN
A
(LSB)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
N
0
1
2
3
4
5
6
7
8
9
10
11
12
13
ALL OFF
ALL OFF
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Depending on the four address inputs, the 4-to-14 line
decoder selects one driver from each of the 14 output A
and B banks of sink drivers according to the Decoder
Truth Table. The state of the selected outputs is deter-
mined by the OUTPUT ENABLE inputs as shown in the
Enable Truth Table.
ENABLE TRUTH TABLE
CHIP
ENABLE
0
1
1
1
1
X = Irrelevant
OUTPUT
ENABLE
A
X
1
0
1
0
OUTPUT
ENABLE
B
X
1
1
0
0
OUTPUTS (OFF unless otherwise specified.
For the value of N see the Decoder Truth Table)
ALL OFF
ALL OFF
OUT
AN
ON
OUT
BN
ON
OUT
AN
ON, OUT
BN
ON
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